I have a solution for Windows 
Installer Appears Every Time I Start an Application:


This solution is related to the Installer launching when starting any of the Microsoft 
Office products (Excel, Word, Powerpoint, etc.).

There was a solution posted on this thread that requires you to edit the registry 
keys for MS Office. This solution will do the same thing without having to directly 
edit the registry:

1. Open the folder containing the EXE file for the Office application. Eg. C:\Program 
Files\Microsoft Office\OFFICE11

2. Create a shortcut of the EXE file (eg. EXCEL.EXE) by right-clicking on it and 
select "Create Shortcut".

3. Edit the shortcut and add the "/o" switch to the end of the "Target" string. Eg. 
"C:\Program Files\Microsoft Office\OFFICE11\EXCEL.EXE" /o

4. Now double click on the shortcut. The "/o" switch will force Windows to re-register 
the Office application, thereby fixing the registry for you automatically.

There you go, the Windows Installer will not launch anymore when you start an Office 
application.

Note: This fix was found using the following MS support document:
http://support.microsoft.com/kb/291288

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